Jackman, who has already dealt with skin cancer, nominated Ricky Gervais, Neil Patrick Harris, and Michael Strahan to do their exams, and Gervais has already posted his. He nominated William Shatner, who posted a photo of himself doing a two-handed examination.

“The awareness of testicular cancer is too important not to grasp this opportunity with both hands,” Shatner wrote as he nominated Josh Groban and Misha Collins.

This potentially viral campaign may be more difficult to publicize because of the photo content.